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atomic_block.go
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atomic_block.go
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// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package platformvm
import (
"errors"
"fmt"
"github.com/ava-labs/avalanchego/database/versiondb"
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/snow/choices"
"github.com/ava-labs/avalanchego/vms/components/core"
)
var (
errConflictingParentTxs = errors.New("block contains a transaction that conflicts with a transaction in a parent block")
)
// AtomicBlock being accepted results in the transaction contained in the
// block to be accepted and committed to the chain.
type AtomicBlock struct {
CommonDecisionBlock `serialize:"true"`
Tx Tx `serialize:"true" json:"tx"`
inputs ids.Set
}
// initialize this block
func (ab *AtomicBlock) initialize(vm *VM, bytes []byte) error {
if err := ab.CommonDecisionBlock.initialize(vm, bytes); err != nil {
return fmt.Errorf("failed to initialize: %w", err)
}
unsignedBytes, err := vm.codec.Marshal(codecVersion, &ab.Tx.UnsignedTx)
if err != nil {
return fmt.Errorf("failed to marshal unsigned tx: %w", err)
}
signedBytes, err := ab.vm.codec.Marshal(codecVersion, &ab.Tx)
if err != nil {
return fmt.Errorf("failed to marshal tx: %w", err)
}
ab.Tx.Initialize(unsignedBytes, signedBytes)
return nil
}
// Reject implements the snowman.Block interface
func (ab *AtomicBlock) conflicts(s ids.Set) bool {
if ab.Status() == choices.Accepted {
return false
}
if ab.inputs.Overlaps(s) {
return true
}
return ab.parentBlock().conflicts(s)
}
// Verify this block performs a valid state transition.
//
// The parent block must be a proposal
//
// This function also sets onAcceptDB database if the verification passes.
func (ab *AtomicBlock) Verify() error {
if err := ab.CommonDecisionBlock.Verify(); err != nil {
if err := ab.Reject(); err != nil {
ab.vm.Ctx.Log.Error("failed to reject atomic block %s due to %s", ab.ID(), err)
}
return err
}
tx, ok := ab.Tx.UnsignedTx.(UnsignedAtomicTx)
if !ok {
return errWrongTxType
}
ab.inputs = tx.InputUTXOs()
parentBlock := ab.parentBlock()
if parentBlock.conflicts(ab.inputs) {
return errConflictingParentTxs
}
// AtomicBlock is not a modifier on a proposal block, so its parent must be
// a decision.
parent, ok := parentBlock.(decision)
if !ok {
return errInvalidBlockType
}
pdb := parent.onAccept()
ab.onAcceptDB = versiondb.New(pdb)
if err := tx.SemanticVerify(ab.vm, ab.onAcceptDB, &ab.Tx); err != nil {
ab.vm.droppedTxCache.Put(ab.Tx.ID(), err.Error()) // cache tx as dropped
return fmt.Errorf("tx %s failed semantic verification: %w", tx.ID(), err)
}
txBytes := ab.Tx.Bytes()
if err := ab.vm.putTx(ab.onAcceptDB, ab.Tx.ID(), txBytes); err != nil {
return fmt.Errorf("failed to put tx %s: %w", tx.ID(), err)
} else if err := ab.vm.putStatus(ab.onAcceptDB, ab.Tx.ID(), Committed); err != nil {
return fmt.Errorf("failed to put status of tx %s: %w", tx.ID(), err)
}
ab.vm.currentBlocks[ab.ID()] = ab
ab.parentBlock().addChild(ab)
return nil
}
// Accept implements the snowman.Block interface
func (ab *AtomicBlock) Accept() error {
ab.vm.Ctx.Log.Verbo("Accepting Atomic Block %s at height %d with parent %s", ab.ID(), ab.Height(), ab.ParentID())
tx, ok := ab.Tx.UnsignedTx.(UnsignedAtomicTx)
if !ok {
return errWrongTxType
}
if err := ab.CommonBlock.Accept(); err != nil {
return fmt.Errorf("failed to accept CommonBlock of %s: %w", ab.ID(), err)
}
// Update the state of the chain in the database
if err := ab.onAcceptDB.Commit(); err != nil {
return fmt.Errorf("failed to commit onAcceptDB for block %s: %w", ab.ID(), err)
}
batch, err := ab.vm.DB.CommitBatch()
if err != nil {
return fmt.Errorf("failed to commit VM's database for block %s: %w", ab.ID(), err)
}
defer ab.vm.DB.Abort()
if err := tx.Accept(ab.vm.Ctx, batch); err != nil {
return fmt.Errorf("failed to atomically accept tx %s in block %s: %w", tx.ID(), ab.ID(), err)
}
for _, child := range ab.children {
child.setBaseDatabase(ab.vm.DB)
}
if ab.onAcceptFunc != nil {
if err := ab.onAcceptFunc(); err != nil {
return fmt.Errorf("failed to execute onAcceptFunc of %s: %w", ab.ID(), err)
}
}
ab.free()
return nil
}
// Reject implements the snowman.Block interface
func (ab *AtomicBlock) Reject() error {
ab.vm.Ctx.Log.Verbo("Rejecting Atomic Block %s at height %d with parent %s", ab.ID(), ab.Height(), ab.ParentID())
if err := ab.vm.mempool.IssueTx(&ab.Tx); err != nil {
ab.vm.Ctx.Log.Debug("failed to reissue tx %q due to: %s", ab.Tx.ID(), err)
}
return ab.CommonDecisionBlock.Reject()
}
// newAtomicBlock returns a new *AtomicBlock where the block's parent, a
// decision block, has ID [parentID].
func (vm *VM) newAtomicBlock(parentID ids.ID, height uint64, tx Tx) (*AtomicBlock, error) {
ab := &AtomicBlock{
CommonDecisionBlock: CommonDecisionBlock{
CommonBlock: CommonBlock{
Block: core.NewBlock(parentID, height),
vm: vm,
},
},
Tx: tx,
}
// We serialize this block as a Block so that it can be deserialized into a
// Block
blk := Block(ab)
bytes, err := Codec.Marshal(codecVersion, &blk)
if err != nil {
return nil, fmt.Errorf("failed to marshal block: %w", err)
}
ab.Block.Initialize(bytes, vm.SnowmanVM)
return ab, nil
}